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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41285a928b38ce5d4e1a0925ffc934c2583fb610cd2ac2d07ffc51c25d6a4b0f' 
  AND token = 'h0jIigMTi9Q7khgaHhBfeCVp7NYkF2kmRzCq6p+Qdqs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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