SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ab0241fcb7f611451873540cc632c7fa0abd4d5460a9b11f9dcd4d9a6727589' 
  AND token = 'qKtwcBFADGGhJDBo2nt51dnYxogISF1sCXNeGJlZHUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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