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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39816d5e55f247f1bd678336cb004b261d1c90c9297e6fdeb220e6c257c86efe' 
  AND token = 'utOiscPfgenU6qTD+ZpnQrBveAobJ4NZH5k68ilITEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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