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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44f1f4d4709d91074fc816a66126ff27578c5761bf0891f6ffde5026c99b3329' 
  AND token = 'CTqtL6ssBBMZdkBWPD6A+YSp5Sdj/exAfA/ZZ8bcuD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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