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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c3672eba35b30ff26d3a968384bbe1ca305a39ce8f58d1ee1a315b5c0d4ba1b' 
  AND token = 'XQhF0l9PF4Pj+7yQP0IHWxwq8dTTslNbPQbsooRZwhg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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