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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef59ac4ccb3cd68cf83a5efa67639670a25af4b53aa77f07a3517a06a512175d' 
  AND token = '1X6H8YHp/O5MKojuDJl9Rh8qe++1Ie+KLM2Pt7c6qZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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