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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4f71f646bf08f0037602693793cd5a9b7cbb0f5cedcea17617ee11e7d7ed2fc' 
  AND token = 'zrizOo/PZ9mBHkx+1LLkefnYZvYhzfk86hNm3hdT7Q0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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