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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa3f5dc02cf1fd8a74d7a9f7e78ccb45c41f4c72e0625e40443097d40052bc2b' 
  AND token = '+ahnyLxucoHrlWl89n1WJaHFIs5t8o490VS/aBVTAgk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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