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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9b838ec8f05bab78e6336e76e6c1a97b55119e9fde0fce39b9518721b5fe7b9' 
  AND token = 'qN356yp7UY/acPQbqBL2U5EmcjKWc+kWGZ2zX6dHcWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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