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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '206579d9d56f4d92527fea33483738cd1f85247f9fadae30b7923a4d3dc76cda' 
  AND token = 'y/Gxbh9RCxYY7YucDrTa28VHe5FWsVbwpzudKiXtjaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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