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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acfbf5cc9c3de49164d8169fc3421c9331311f77168d7c7e8481eb74a572bf8b' 
  AND token = 'ARk3gsWf36o/YOAQL6+Ad+R6hLfVSMRzes99gizyse8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00085

JSON explain

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