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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96463f97f8926dbd117910d09848502d35da51420c67f0f87f207abfae7e34de' 
  AND token = 'QQuXOXIcx+/QWwfJUYrbRd3xymIYlRgrZ0iaOz0iSII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}