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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce92871adeeb31f05bf717ce684636b86b2f1e35f9b4b0079a6cf4efaafc693e' 
  AND token = 'yl4QzU4kfcAyu56wBKP4q2X3YnPh/D2UhIuKhNsnQGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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