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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e32d30f01c7495b64b7a255fe93da7c065f111044f33a4779858fae87b2e3ce0' 
  AND token = 'RYmgTtAb06l/fxdLwA2MEnK7HXiWV+6JWteDh4J/hlU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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