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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28b7ba2db980e0780299274c2af121da90dc11b03c1131db1b86ea9257aaad8e' 
  AND token = '9mzWSwMMPrFA1stWNDbv4+xbVsEj6I6UCLgK0iN04kk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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