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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea7e297fe1ef342582c110b44f4d84eface2d08315728508ea9a9a13554c0472' 
  AND token = 'n9gkOfFDJMSfoCT0X/6Kc7O6jrVFLhMQytZ3eE6oWto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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