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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89e2362477089c40fe57a08653aab4f43aea26ad7cdeac2b5723fa96da68b01a' 
  AND token = 'nQ76CP3u2Bly26nTl4BgJpfHGcAq60pxvhcyxcsvtEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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