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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c228d5568b0d9f6a2a7c4f0888b722aa7e1392d3279b3560ed00a48d2f9c4c94' 
  AND token = 'WKwXtghKUmo3upH24aHyV8X/L/kdp+MLeOjF2Kns06E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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