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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fb50044c1d233f7b8fa241f98740cde2666c3b57417f624b201192648af7b17' 
  AND token = 'd4cBzEhVClGB5rIGkd2oEPoKH397BGbu4/pPQNXstMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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