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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '550eae68170d300beaa2fd1259a8f7e0dfc46b7c80c7c17d2f10abe12f5f009d' 
  AND token = 'X/4tfoH5YtbbxzI7B/tx7XH8/4W7jqte7ui20HWEhQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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