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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30ba3dc5366532ef9af433c7504cebff6d91b3b1a5a1ed9668724e2a13b31bdd' 
  AND token = 'pKnDESXg7r5ibmBdpJsNDIIDJOLyclC5e7/yUN70UBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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