SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6174f3da42b30d2b4286a421cc4fdea1afbdce7eb46d44207defbf2938a8086' 
  AND token = 'YNIgmovVzW7RzzDhsHuwh/IZPiAzpKov/Zj9Ce9sSeY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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