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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ae7685bf7ebe8632d27b6450039a82bd2d32c8b1bf47059f05c55faa8fa00df' 
  AND token = '3v/HAIgwWkKVg8ZPWocR8WDIXOFVsWTEH+T0blMtA5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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