SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cbee47e773ab2164f96291526daf18cdf2488f8fc6a3383ca2093a8e7cc2a04' 
  AND token = 'trZWT5qBgRZpSGPVufOZn5BcgKPg87QL7D1KKjXQGrQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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