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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7992765d1509b963deaa6a0ff68f0448c26c5c11cec123dab5bd6133e5ac4396' 
  AND token = '9wHoK2w7R6e/rd/zn3yqGDhqLmbdjkwTRvW1c3a2BbM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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