SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '434ef521619b27821e1c68b30769ac3259fac41e972f1157ee91c4be80d30150' 
  AND token = 'cEOupRBPpWyXFQvanHKxqkJDKVbrYc6q9vh71ojjHL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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