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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e92409c8d60d671c4df6b099db67ee48cbba3acc2bebee3a80d0a9232a649717' 
  AND token = 'l0GFzcOgH7CkM49RCUW03XSxdMYWWr8mOtSmx7PlWA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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