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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c08f1306d3e8b1e8d09d6997b46e305ebaf9b5c18a4ae6e33adb083eb77d6d13' 
  AND token = 'zjE54bJ1kBVaNJFsAn//Ps6YUEcCng6tIxw1oAWCebM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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