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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd39cf142aafa09887aab074b5f10c03d22c54bf05ccbb654113ef529f13cf68c' 
  AND token = 'cY4Xfqa6U4q6iZ2WD5Pn7RldGa3sKN2qQisKDTbDr6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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