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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81431d333e049fadc15cf773f5c8558bdcfee5e43efde85bab7eabaa48f97b6d' 
  AND token = 'ibbYG07XuiIk+N+mLfrFbxwkG5zGstEIe262RqU9UTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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