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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16dadf4fd021c3b5076c45c6a172749f64d133f6d640670c6de648efc4f06ea2' 
  AND token = '+lw7wvSmzEzENUfcsz/rDp2O01P6wlXOgJdEcvlhm+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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