SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f72c223e6ef93542415cd0b6de1d83ac3317ed45444e89d66d054c91179ea66' 
  AND token = 'h54IK2G/HpJ/qUvVdZFBoHTh1c9gi6zZdBilrFMn7YY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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