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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c41e4e099055961210014ce5fa8102a88abe0172fb18340f906b30508fc39b19' 
  AND token = '236OLbFWaumnYBV2FPld0n/uUCfVT7L4H81pmMsgoo0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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