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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98f57b713ba3fe7666f74fe9051fecfdd07ae1a85e335a648e64d03f4e7a0eb4' 
  AND token = '5WR0VRp9NtpOOxThr8Luk40WREofZINfE2p3bvlybUc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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