SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee9e5229d1b6cf5a703e8c4b44f359c9bed16db6cfc6af58e84c3a143942b646' 
  AND token = 'R+wNcpH7WWXrGJnI8G0gNJX5jQYZdSsxqBykmEFqxmo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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