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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '524974581fc4a21962eeedfe27a4de7c28f0342dfcf714d4ed67e8ed4947d893' 
  AND token = 'MYwWW0LKlNb1uR4S7qZ1m1rSx88x0LQZaN+HaRIwXuU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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