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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd067a86ff0c18031fdeb6e73e9fed651ac7b7113f474f187877f9042885d9dda' 
  AND token = 'UYO17chm2jB3cz8+HbxDlkD5EoHFsVEkk2YJonLdFio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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