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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa55a8e3283c70ffb73d545f70f7e9b178d764b00258e8def8954ae91b5217b2' 
  AND token = 'KuPbwmqy68Opupaxx+IAx5nVVNDMtJxMCuWMZFkqqKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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