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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58639a177f37ccb6cc6fc411acba52c409c5b30eb8e94fe03cdde7a8be63a293' 
  AND token = 'L1fgFmF8Luce1WLNTFlATOal81D2/YtFNbCEM4W53T8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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