SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92cf09946ba64cdc9f9fcd0642885d6ad72b3b7f77e38d8a710ac349fd15ada9' 
  AND token = 'ghfyAW/8vBV/OZbgkwOzeESQxFfO6UOXNuKwxGsVh9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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