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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9e5f341ada2c6bb82e6ba27362669fdb9a36f5f9d74c3d250fcaa3fd887b8db' 
  AND token = 'wbQ2Lh1S/yRGcmbhSEOpXXj1jFG7TgPtjr2cPJ5/60A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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