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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab19a64e2a486ab34a080790105bcb489fcd189538dffad727448d3a0e6143bd' 
  AND token = 'wMWYCLcCEmjBl04IGAy6ccDjmYJuf+S0qaYI1kwfy4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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