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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df0f72f8e8b252af3b1ed158e47e3789f31f28d520e2afa78d06ef539c247eb9' 
  AND token = 'En29N17B9XQXf/MVjM8fJUzFaTEx33cw0EYfbOAv+N4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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