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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40e68d97bca1e7f48a45e5bc7e14586f61b290ee9236cb118b32352eb31301ee' 
  AND token = 's/gUnc1Zpk7ORkV0rGxJDUplpgbVaAwAMTzc4p1ENuQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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