SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74f0f991b646f0d643a6caf9a5efd3aa31134252fe9c4e4c3227d2bee287b6bd' 
  AND token = 'rhzICqNsK4TptBEvYmlfeJmBUlIKlbtUEueWXCW2rOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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