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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '055bc3cca5f2db9439c62fe64df15d812445668a23e7a94c1549499deadd4049' 
  AND token = '8q7Kl0eAUXok7FGVpHXBd3oZtZrWJuzfHqp5lVIf1uk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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