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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04383eeb726d0117cd4306a21837d222b394fb002c5c9320c7b09b434c799e54' 
  AND token = 'BpkQ2cGSxyOo6iXOaIIqoPeKM+ab2wundKOfnk6voWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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