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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '892304092f649b6929b67cdd25cf466124ee327d812ff3ec8d8ac6fb23fe589e' 
  AND token = 'WXgM76evgC56gZisP6Ybm2sHblyyFdXhwCTBZvbDKt8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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