SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e62a33c34bd352f514a93a0f6ea3418e2155da7734db37df9568e75d77c8b123' 
  AND token = 'MFwjHL8UqVjcrLIpfXJd8kz7moYZpJRAQ5swqzJz8YU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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