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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26d2a163b2e8ebe344e81bfe10566b0e4e311781785a402b8676f297a3ee99c0' 
  AND token = '6E6APRc5wgzK6Kj5+CROeTwKeJjvwNXTPRf5sXIg6Zw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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