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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '476114fc3a8d62f9b2589ad4b62db00b646d5a120bbbcc6c26f48323ef98d151' 
  AND token = 'm2ggjvOu4Gp3i7RiHG82Hg5xlfcUivDcsb7xG7ZuxRA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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