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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7561c2edb018aa8f704245790540bf9df6d4f0d4fbf996c77e0c618faeba629' 
  AND token = 'cPAkd5ncFf5CvFpLEUDVdPfs+RxD5hTbgkF19GwcK+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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