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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05cacc97ecea090dc8cf672a3a49e988189c8708ecb41190b7317f1b5d891845' 
  AND token = 'gZbpRMp6L7ZmEKN8sJSn2445CBAbez+FurzY7VJ0DfI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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