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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3476eb5561021cf6b2ed1a58484b904a4e98402dc750ce1aaac45b452ecc6d1' 
  AND token = 'GY2aaEVt8H1LLya+cv2Kcy1SCANei8cLfkudmzqk/7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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