SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '067ba4412d76c64f7e2d757363e621f43efaaf48ef90c213562581045ce0ed7a' 
  AND token = 'RmAMKF+afAhpOCswD4iMq7VIIY+tGqZlZ2KwJuW+kXw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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