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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74940d476f194b3b391a90bf779f42c499ceb76946809818e89f1044329c5adc' 
  AND token = 'Ybz4AQQxmj3N6fyMLXs/0cb8u8+H1EUKUImdT2RDx0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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