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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fedce9e43f95aa910b803415e5b0426ccedf17c58ee10aa8e1fa014e542cc659' 
  AND token = 'QmDAj5Qr7OpEESrEmcvvOZIr68E7GWrYEIEufnIi+Dw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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