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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db895af35c476255b259da3903b7f2cb30751e172566a3478508190129130e76' 
  AND token = 'R2XDf0SQr9ofMBtLV3KyjIbYq7QesDnAiCSzJYY/f2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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