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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ef81821473813a773855bf19beddad620853f7182bfb7a7483c06fd803c4712' 
  AND token = 'N4xBzOSfPUztbv98b6d0BkTml5Sk4oNR/gS496/wYLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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