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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3423b9c637deff44646155f51aa2f059e94b55b6bf001211bc691e17b8c1038' 
  AND token = 'fFp5I37rqO8Kf2ccHQi5Q/ftmmch7wTix88eNFh6ApM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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