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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8acab1e31d9bdfba18f34697c4e620010f142e6cfae53a96c2cf02e80f7b3117' 
  AND token = 'apS0T4HWV1B3BP+4867YYnAf9Oa5f0OBgOX1q57PrG8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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